@article{21821,
  abstract     = {Molecular photoswitches provide a means for imparting synthetic structures with intrinsically logical and highly
tunable photoresponsive properties. One variety of organic photoswitches known as Donor-Acceptor Stenhouse
Adducts, or DASAs, are promising candidates for next generation light responsive materials because of their
unique ability to stabilize three photochemically distinct isomeric states in solution, while their counterparts are
strictly limited to binary state behavior. In this work, we show how polymethacrylate host matrices shift the
energetic landscape of DASA relative to solution, prohibiting accumulation of an intermediate third isomeric
state by decelerating critical steps in the photoswitching mechanism. Specifically, we employ a dual-wavelength,
phase locked detection scheme to probe thermal isomerizations in the switching process that occur at fast (~ms)
time scales that are inaccessible by standard UV–Vis spectroscopic techniques. The results of this study provide
valuable insight into the mechanism of multistate DASA reactivity and establish the foundation necessary to
guide future efforts in offsetting kinetic matrix effects to enable dynamic, three state photoswitching in polymeric
hosts. },
  author       = {Sandlass, Sara and Stricker, Friedrich J and Fragoso, Daniel and de Alaniz, Javier Read and Gordon, Michael J.},
  issn         = {1873-2666},
  journal      = {Journal of Photochemistry and Photobiology A: Chemistry},
  publisher    = {Elsevier},
  title        = {{Effect of polymer host matrix on multi-stage isomerization kinetics of DASA photochromes}},
  doi          = {10.1016/j.jphotochem.2023.114964},
  volume       = {444},
  year         = {2023},
}